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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The shell of the Cochran boiler is made hemispherical

None of these
Both (A) and (B)
To withstand the pressure of steam inside the boiler
To give maximum space and strength

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is used to blow off steam when the

Water level in the boiler becomes too low
Steam pressure exceeds the working pressure
Both (A) and (B)
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Provide support for boiler
Take care of failure in shear
Take care of failure in compression
Prevent flat surfaces under pressure from tearing apart

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

p₂/p₁
p₁ + p₂
p₁/p₂
p₁. p₂

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Steam Boilers, Engines, Nozzles and Turbines
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

Safety valve
Stop valve
Blow off cock
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
The clearance in the engine cylinder

Decreases the efficiency of the engine
All of these
Increases the mean effective pressure
Increases the workdone

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